light and proximoty sensors

Light and prox sensors are on the top next to the Verizon logo, under the earpiece. They're used during calls and for turning off/dimming/brightening the screen. I doubt any app or game uses them.
 
And the camera flash. There are a few apps in the market but none of them look very interesting.
 
If the light sensor on the phone then how come I cannot see my screen in the daylight like I could my bb?
 
Just the way the screen is. It's viewable sometimes in extreme sunlight if you crank the brightness up.